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Old 05-25-2009, 04:21 PM   #1
carmv4
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Join Date: May 2008
Location: Hamilton
Posts: 165
Engine Oil Question

Which oil is better for an M50 and why?

Mobil1 15w50 or Lubromoly Synthoil 5w40

It's only a summer car and the Bentley says to run 15w40 in warmer weather but I keep on reading about people running the 5w40 Lubromoly.
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